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[FLINK-21344] Handle heap timers in Rocks state
We serialize the heap timers into the same format as if they were actually stored in RocksDB instead of storing them in a raw operator state. It lets users change between using heap and RocksDB timers.
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flink-runtime/src/main/java/org/apache/flink/runtime/state/HeapPriorityQueuesManager.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.apache.flink.runtime.state; | ||
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| import org.apache.flink.annotation.Internal; | ||
| import org.apache.flink.api.common.typeutils.TypeSerializer; | ||
| import org.apache.flink.api.common.typeutils.TypeSerializerSchemaCompatibility; | ||
| import org.apache.flink.runtime.state.heap.HeapPriorityQueueElement; | ||
| import org.apache.flink.runtime.state.heap.HeapPriorityQueueSet; | ||
| import org.apache.flink.runtime.state.heap.HeapPriorityQueueSetFactory; | ||
| import org.apache.flink.runtime.state.heap.HeapPriorityQueueSnapshotRestoreWrapper; | ||
| import org.apache.flink.util.FlinkRuntimeException; | ||
| import org.apache.flink.util.StateMigrationException; | ||
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| import javax.annotation.Nonnull; | ||
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| import java.util.Map; | ||
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| /** Manages creating heap priority queues along with their counterpart meta info. */ | ||
| @Internal | ||
| public class HeapPriorityQueuesManager { | ||
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| private final Map<String, HeapPriorityQueueSnapshotRestoreWrapper<?>> registeredPQStates; | ||
| private final HeapPriorityQueueSetFactory priorityQueueSetFactory; | ||
| private final KeyGroupRange keyGroupRange; | ||
| private final int numberOfKeyGroups; | ||
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| public HeapPriorityQueuesManager( | ||
| Map<String, HeapPriorityQueueSnapshotRestoreWrapper<?>> registeredPQStates, | ||
| HeapPriorityQueueSetFactory priorityQueueSetFactory, | ||
| KeyGroupRange keyGroupRange, | ||
| int numberOfKeyGroups) { | ||
| this.registeredPQStates = registeredPQStates; | ||
| this.priorityQueueSetFactory = priorityQueueSetFactory; | ||
| this.keyGroupRange = keyGroupRange; | ||
| this.numberOfKeyGroups = numberOfKeyGroups; | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| @Nonnull | ||
| public <T extends HeapPriorityQueueElement & PriorityComparable<? super T> & Keyed<?>> | ||
| KeyGroupedInternalPriorityQueue<T> createOrUpdate( | ||
| @Nonnull String stateName, | ||
| @Nonnull TypeSerializer<T> byteOrderedElementSerializer) { | ||
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| final HeapPriorityQueueSnapshotRestoreWrapper<T> existingState = | ||
| (HeapPriorityQueueSnapshotRestoreWrapper<T>) registeredPQStates.get(stateName); | ||
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| if (existingState != null) { | ||
| TypeSerializerSchemaCompatibility<T> compatibilityResult = | ||
| existingState | ||
| .getMetaInfo() | ||
| .updateElementSerializer(byteOrderedElementSerializer); | ||
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| if (compatibilityResult.isIncompatible()) { | ||
| throw new FlinkRuntimeException( | ||
| new StateMigrationException( | ||
| "For heap backends, the new priority queue serializer must not be incompatible.")); | ||
| } else { | ||
| registeredPQStates.put( | ||
| stateName, | ||
| existingState.forUpdatedSerializer(byteOrderedElementSerializer)); | ||
| } | ||
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| return existingState.getPriorityQueue(); | ||
| } else { | ||
| final RegisteredPriorityQueueStateBackendMetaInfo<T> metaInfo = | ||
| new RegisteredPriorityQueueStateBackendMetaInfo<>( | ||
| stateName, byteOrderedElementSerializer); | ||
| return createInternal(metaInfo); | ||
| } | ||
| } | ||
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| @Nonnull | ||
| private <T extends HeapPriorityQueueElement & PriorityComparable<? super T> & Keyed<?>> | ||
| KeyGroupedInternalPriorityQueue<T> createInternal( | ||
| RegisteredPriorityQueueStateBackendMetaInfo<T> metaInfo) { | ||
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| final String stateName = metaInfo.getName(); | ||
| final HeapPriorityQueueSet<T> priorityQueue = | ||
| priorityQueueSetFactory.create(stateName, metaInfo.getElementSerializer()); | ||
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| HeapPriorityQueueSnapshotRestoreWrapper<T> wrapper = | ||
| new HeapPriorityQueueSnapshotRestoreWrapper<>( | ||
| priorityQueue, | ||
| metaInfo, | ||
| KeyExtractorFunction.forKeyedObjects(), | ||
| keyGroupRange, | ||
| numberOfKeyGroups); | ||
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| registeredPQStates.put(stateName, wrapper); | ||
| return priorityQueue; | ||
| } | ||
| } |
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